More hormones are produced when your body has an increased demand for energy, like during pregnancy to grow the baby. If it can't meet that demand, then you either won't be able to get pregnant or have an increased risk of miscarriage.

Many symptoms of an underactive thyroid mimic the signs of aging so doctors often overlook the thyroid as a cause of infertility.

Symptoms like:

menstrual cycle irregularities

fatigue

brain fog, memory loss

weight gain or difficulty losing weight

low sex drive

hair loss

dry skin

Even if doctors get the thyroid tested, the tests ordered often aren't comprehensive enough to determine if there's a problem with the thyroid.